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<pre><span class="sourceLineNo">001</span>/* ===========================================================<a name="line.1"></a>
<span class="sourceLineNo">002</span> * JFreeChart : a free chart library for the Java(tm) platform<a name="line.2"></a>
<span class="sourceLineNo">003</span> * ===========================================================<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * (C) Copyright 2000-2011, by Object Refinery Limited and Contributors.<a name="line.5"></a>
<span class="sourceLineNo">006</span> *<a name="line.6"></a>
<span class="sourceLineNo">007</span> * Project Info:  http://www.jfree.org/jfreechart/index.html<a name="line.7"></a>
<span class="sourceLineNo">008</span> *<a name="line.8"></a>
<span class="sourceLineNo">009</span> * This library is free software; you can redistribute it and/or modify it<a name="line.9"></a>
<span class="sourceLineNo">010</span> * under the terms of the GNU Lesser General Public License as published by<a name="line.10"></a>
<span class="sourceLineNo">011</span> * the Free Software Foundation; either version 2.1 of the License, or<a name="line.11"></a>
<span class="sourceLineNo">012</span> * (at your option) any later version.<a name="line.12"></a>
<span class="sourceLineNo">013</span> *<a name="line.13"></a>
<span class="sourceLineNo">014</span> * This library is distributed in the hope that it will be useful, but<a name="line.14"></a>
<span class="sourceLineNo">015</span> * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY<a name="line.15"></a>
<span class="sourceLineNo">016</span> * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public<a name="line.16"></a>
<span class="sourceLineNo">017</span> * License for more details.<a name="line.17"></a>
<span class="sourceLineNo">018</span> *<a name="line.18"></a>
<span class="sourceLineNo">019</span> * You should have received a copy of the GNU Lesser General Public<a name="line.19"></a>
<span class="sourceLineNo">020</span> * License along with this library; if not, write to the Free Software<a name="line.20"></a>
<span class="sourceLineNo">021</span> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,<a name="line.21"></a>
<span class="sourceLineNo">022</span> * USA.<a name="line.22"></a>
<span class="sourceLineNo">023</span> *<a name="line.23"></a>
<span class="sourceLineNo">024</span> * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. <a name="line.24"></a>
<span class="sourceLineNo">025</span> * Other names may be trademarks of their respective owners.]<a name="line.25"></a>
<span class="sourceLineNo">026</span> *<a name="line.26"></a>
<span class="sourceLineNo">027</span> * ------------------------<a name="line.27"></a>
<span class="sourceLineNo">028</span> * PieLabelDistributor.java<a name="line.28"></a>
<span class="sourceLineNo">029</span> * ------------------------<a name="line.29"></a>
<span class="sourceLineNo">030</span> * (C) Copyright 2004-2008, by Object Refinery Limited and Contributors.<a name="line.30"></a>
<span class="sourceLineNo">031</span> *<a name="line.31"></a>
<span class="sourceLineNo">032</span> * Original Author:  David Gilbert (for Object Refinery Limited);<a name="line.32"></a>
<span class="sourceLineNo">033</span> * Contributor(s):   -;<a name="line.33"></a>
<span class="sourceLineNo">034</span> *<a name="line.34"></a>
<span class="sourceLineNo">035</span> * Changes<a name="line.35"></a>
<span class="sourceLineNo">036</span> * -------<a name="line.36"></a>
<span class="sourceLineNo">037</span> * 08-Mar-2004 : Version 1 (DG);<a name="line.37"></a>
<span class="sourceLineNo">038</span> * 18-Apr-2005 : Use StringBuffer (DG);<a name="line.38"></a>
<span class="sourceLineNo">039</span> * 14-Jun-2007 : Now extends AbstractPieLabelDistributor (DG);<a name="line.39"></a>
<span class="sourceLineNo">040</span> * 31-Mar-2008 : Fix bugs in label distribution (DG);<a name="line.40"></a>
<span class="sourceLineNo">041</span> *<a name="line.41"></a>
<span class="sourceLineNo">042</span> */<a name="line.42"></a>
<span class="sourceLineNo">043</span><a name="line.43"></a>
<span class="sourceLineNo">044</span>package org.jfree.chart.plot;<a name="line.44"></a>
<span class="sourceLineNo">045</span><a name="line.45"></a>
<span class="sourceLineNo">046</span>import java.util.Collections;<a name="line.46"></a>
<span class="sourceLineNo">047</span><a name="line.47"></a>
<span class="sourceLineNo">048</span>/**<a name="line.48"></a>
<span class="sourceLineNo">049</span> * This class distributes the section labels for one side of a pie chart so<a name="line.49"></a>
<span class="sourceLineNo">050</span> * that they do not overlap.<a name="line.50"></a>
<span class="sourceLineNo">051</span> */<a name="line.51"></a>
<span class="sourceLineNo">052</span>public class PieLabelDistributor extends AbstractPieLabelDistributor {<a name="line.52"></a>
<span class="sourceLineNo">053</span><a name="line.53"></a>
<span class="sourceLineNo">054</span>    /** The minimum gap. */<a name="line.54"></a>
<span class="sourceLineNo">055</span>    private double minGap = 4.0;<a name="line.55"></a>
<span class="sourceLineNo">056</span><a name="line.56"></a>
<span class="sourceLineNo">057</span>    /**<a name="line.57"></a>
<span class="sourceLineNo">058</span>     * Creates a new distributor.<a name="line.58"></a>
<span class="sourceLineNo">059</span>     *<a name="line.59"></a>
<span class="sourceLineNo">060</span>     * @param labelCount  the number of labels (ignored).<a name="line.60"></a>
<span class="sourceLineNo">061</span>     */<a name="line.61"></a>
<span class="sourceLineNo">062</span>    public PieLabelDistributor(int labelCount) {<a name="line.62"></a>
<span class="sourceLineNo">063</span>        super();<a name="line.63"></a>
<span class="sourceLineNo">064</span>    }<a name="line.64"></a>
<span class="sourceLineNo">065</span><a name="line.65"></a>
<span class="sourceLineNo">066</span>    /**<a name="line.66"></a>
<span class="sourceLineNo">067</span>     * Distributes the labels.<a name="line.67"></a>
<span class="sourceLineNo">068</span>     *<a name="line.68"></a>
<span class="sourceLineNo">069</span>     * @param minY  the minimum y-coordinate in Java2D-space.<a name="line.69"></a>
<span class="sourceLineNo">070</span>     * @param height  the available height (in Java2D units).<a name="line.70"></a>
<span class="sourceLineNo">071</span>     */<a name="line.71"></a>
<span class="sourceLineNo">072</span>    public void distributeLabels(double minY, double height) {<a name="line.72"></a>
<span class="sourceLineNo">073</span>        sort();  // sorts the label records into ascending order by baseY<a name="line.73"></a>
<span class="sourceLineNo">074</span>//        if (isOverlap()) {<a name="line.74"></a>
<span class="sourceLineNo">075</span>//            adjustInwards();<a name="line.75"></a>
<span class="sourceLineNo">076</span>//        }<a name="line.76"></a>
<span class="sourceLineNo">077</span>        // if still overlapping, do something else...<a name="line.77"></a>
<span class="sourceLineNo">078</span>        if (isOverlap()) {<a name="line.78"></a>
<span class="sourceLineNo">079</span>            adjustDownwards(minY, height);<a name="line.79"></a>
<span class="sourceLineNo">080</span>        }<a name="line.80"></a>
<span class="sourceLineNo">081</span><a name="line.81"></a>
<span class="sourceLineNo">082</span>        if (isOverlap()) {<a name="line.82"></a>
<span class="sourceLineNo">083</span>            adjustUpwards(minY, height);<a name="line.83"></a>
<span class="sourceLineNo">084</span>        }<a name="line.84"></a>
<span class="sourceLineNo">085</span><a name="line.85"></a>
<span class="sourceLineNo">086</span>        if (isOverlap()) {<a name="line.86"></a>
<span class="sourceLineNo">087</span>            spreadEvenly(minY, height);<a name="line.87"></a>
<span class="sourceLineNo">088</span>        }<a name="line.88"></a>
<span class="sourceLineNo">089</span>    }<a name="line.89"></a>
<span class="sourceLineNo">090</span><a name="line.90"></a>
<span class="sourceLineNo">091</span>    /**<a name="line.91"></a>
<span class="sourceLineNo">092</span>     * Returns &lt;code&gt;true&lt;/code&gt; if there are overlapping labels in the list,<a name="line.92"></a>
<span class="sourceLineNo">093</span>     * and &lt;code&gt;false&lt;/code&gt; otherwise.<a name="line.93"></a>
<span class="sourceLineNo">094</span>     *<a name="line.94"></a>
<span class="sourceLineNo">095</span>     * @return A boolean.<a name="line.95"></a>
<span class="sourceLineNo">096</span>     */<a name="line.96"></a>
<span class="sourceLineNo">097</span>    private boolean isOverlap() {<a name="line.97"></a>
<span class="sourceLineNo">098</span>        double y = 0.0;<a name="line.98"></a>
<span class="sourceLineNo">099</span>        for (int i = 0; i &lt; this.labels.size(); i++) {<a name="line.99"></a>
<span class="sourceLineNo">100</span>            PieLabelRecord plr = getPieLabelRecord(i);<a name="line.100"></a>
<span class="sourceLineNo">101</span>            if (y &gt; plr.getLowerY()) {<a name="line.101"></a>
<span class="sourceLineNo">102</span>                return true;<a name="line.102"></a>
<span class="sourceLineNo">103</span>            }<a name="line.103"></a>
<span class="sourceLineNo">104</span>            y = plr.getUpperY();<a name="line.104"></a>
<span class="sourceLineNo">105</span>        }<a name="line.105"></a>
<span class="sourceLineNo">106</span>        return false;<a name="line.106"></a>
<span class="sourceLineNo">107</span>    }<a name="line.107"></a>
<span class="sourceLineNo">108</span><a name="line.108"></a>
<span class="sourceLineNo">109</span>    /**<a name="line.109"></a>
<span class="sourceLineNo">110</span>     * Adjusts the y-coordinate for the labels in towards the center in an<a name="line.110"></a>
<span class="sourceLineNo">111</span>     * attempt to fix overlapping.<a name="line.111"></a>
<span class="sourceLineNo">112</span>     */<a name="line.112"></a>
<span class="sourceLineNo">113</span>    protected void adjustInwards() {<a name="line.113"></a>
<span class="sourceLineNo">114</span>        int lower = 0;<a name="line.114"></a>
<span class="sourceLineNo">115</span>        int upper = this.labels.size() - 1;<a name="line.115"></a>
<span class="sourceLineNo">116</span>        while (upper &gt; lower) {<a name="line.116"></a>
<span class="sourceLineNo">117</span>            if (lower &lt; upper - 1) {<a name="line.117"></a>
<span class="sourceLineNo">118</span>                PieLabelRecord r0 = getPieLabelRecord(lower);<a name="line.118"></a>
<span class="sourceLineNo">119</span>                PieLabelRecord r1 = getPieLabelRecord(lower + 1);<a name="line.119"></a>
<span class="sourceLineNo">120</span>                if (r1.getLowerY() &lt; r0.getUpperY()) {<a name="line.120"></a>
<span class="sourceLineNo">121</span>                    double adjust = r0.getUpperY() - r1.getLowerY()<a name="line.121"></a>
<span class="sourceLineNo">122</span>                                    + this.minGap;<a name="line.122"></a>
<span class="sourceLineNo">123</span>                    r1.setAllocatedY(r1.getAllocatedY() + adjust);<a name="line.123"></a>
<span class="sourceLineNo">124</span>                }<a name="line.124"></a>
<span class="sourceLineNo">125</span>            }<a name="line.125"></a>
<span class="sourceLineNo">126</span>            PieLabelRecord r2 = getPieLabelRecord(upper - 1);<a name="line.126"></a>
<span class="sourceLineNo">127</span>            PieLabelRecord r3 = getPieLabelRecord(upper);<a name="line.127"></a>
<span class="sourceLineNo">128</span>            if (r2.getUpperY() &gt; r3.getLowerY()) {<a name="line.128"></a>
<span class="sourceLineNo">129</span>                double adjust = (r2.getUpperY() - r3.getLowerY()) + this.minGap;<a name="line.129"></a>
<span class="sourceLineNo">130</span>                r3.setAllocatedY(r3.getAllocatedY() + adjust);<a name="line.130"></a>
<span class="sourceLineNo">131</span>            }<a name="line.131"></a>
<span class="sourceLineNo">132</span>            lower++;<a name="line.132"></a>
<span class="sourceLineNo">133</span>            upper--;<a name="line.133"></a>
<span class="sourceLineNo">134</span>        }<a name="line.134"></a>
<span class="sourceLineNo">135</span>    }<a name="line.135"></a>
<span class="sourceLineNo">136</span><a name="line.136"></a>
<span class="sourceLineNo">137</span>    /**<a name="line.137"></a>
<span class="sourceLineNo">138</span>     * Any labels that are overlapping are moved down in an attempt to<a name="line.138"></a>
<span class="sourceLineNo">139</span>     * eliminate the overlaps.<a name="line.139"></a>
<span class="sourceLineNo">140</span>     *<a name="line.140"></a>
<span class="sourceLineNo">141</span>     * @param minY  the minimum y value (in Java2D coordinate space).<a name="line.141"></a>
<span class="sourceLineNo">142</span>     * @param height  the height available for all labels.<a name="line.142"></a>
<span class="sourceLineNo">143</span>     */<a name="line.143"></a>
<span class="sourceLineNo">144</span>    protected void adjustDownwards(double minY, double height) {<a name="line.144"></a>
<span class="sourceLineNo">145</span>        for (int i = 0; i &lt; this.labels.size() - 1; i++) {<a name="line.145"></a>
<span class="sourceLineNo">146</span>            PieLabelRecord record0 = getPieLabelRecord(i);<a name="line.146"></a>
<span class="sourceLineNo">147</span>            PieLabelRecord record1 = getPieLabelRecord(i + 1);<a name="line.147"></a>
<span class="sourceLineNo">148</span>            if (record1.getLowerY() &lt; record0.getUpperY()) {<a name="line.148"></a>
<span class="sourceLineNo">149</span>                record1.setAllocatedY(Math.min(minY + height<a name="line.149"></a>
<span class="sourceLineNo">150</span>                        - record1.getLabelHeight() / 2.0,<a name="line.150"></a>
<span class="sourceLineNo">151</span>                        record0.getUpperY() + this.minGap<a name="line.151"></a>
<span class="sourceLineNo">152</span>                        + record1.getLabelHeight() / 2.0));<a name="line.152"></a>
<span class="sourceLineNo">153</span>            }<a name="line.153"></a>
<span class="sourceLineNo">154</span>        }<a name="line.154"></a>
<span class="sourceLineNo">155</span>    }<a name="line.155"></a>
<span class="sourceLineNo">156</span><a name="line.156"></a>
<span class="sourceLineNo">157</span>    /**<a name="line.157"></a>
<span class="sourceLineNo">158</span>     * Any labels that are overlapping are moved up in an attempt to eliminate<a name="line.158"></a>
<span class="sourceLineNo">159</span>     * the overlaps.<a name="line.159"></a>
<span class="sourceLineNo">160</span>     *<a name="line.160"></a>
<span class="sourceLineNo">161</span>     * @param minY  the minimum y value (in Java2D coordinate space).<a name="line.161"></a>
<span class="sourceLineNo">162</span>     * @param height  the height available for all labels.<a name="line.162"></a>
<span class="sourceLineNo">163</span>     */<a name="line.163"></a>
<span class="sourceLineNo">164</span>    protected void adjustUpwards(double minY, double height) {<a name="line.164"></a>
<span class="sourceLineNo">165</span>        for (int i = this.labels.size() - 1; i &gt; 0; i--) {<a name="line.165"></a>
<span class="sourceLineNo">166</span>            PieLabelRecord record0 = getPieLabelRecord(i);<a name="line.166"></a>
<span class="sourceLineNo">167</span>            PieLabelRecord record1 = getPieLabelRecord(i - 1);<a name="line.167"></a>
<span class="sourceLineNo">168</span>            if (record1.getUpperY() &gt; record0.getLowerY()) {<a name="line.168"></a>
<span class="sourceLineNo">169</span>                record1.setAllocatedY(Math.max(minY<a name="line.169"></a>
<span class="sourceLineNo">170</span>                        + record1.getLabelHeight() / 2.0, record0.getLowerY()<a name="line.170"></a>
<span class="sourceLineNo">171</span>                        - this.minGap - record1.getLabelHeight() / 2.0));<a name="line.171"></a>
<span class="sourceLineNo">172</span>            }<a name="line.172"></a>
<span class="sourceLineNo">173</span>        }<a name="line.173"></a>
<span class="sourceLineNo">174</span>    }<a name="line.174"></a>
<span class="sourceLineNo">175</span><a name="line.175"></a>
<span class="sourceLineNo">176</span>    /**<a name="line.176"></a>
<span class="sourceLineNo">177</span>     * Labels are spaced evenly in the available space in an attempt to<a name="line.177"></a>
<span class="sourceLineNo">178</span>     * eliminate the overlaps.<a name="line.178"></a>
<span class="sourceLineNo">179</span>     *<a name="line.179"></a>
<span class="sourceLineNo">180</span>     * @param minY  the minimum y value (in Java2D coordinate space).<a name="line.180"></a>
<span class="sourceLineNo">181</span>     * @param height  the height available for all labels.<a name="line.181"></a>
<span class="sourceLineNo">182</span>     */<a name="line.182"></a>
<span class="sourceLineNo">183</span>    protected void spreadEvenly(double minY, double height) {<a name="line.183"></a>
<span class="sourceLineNo">184</span>        double y = minY;<a name="line.184"></a>
<span class="sourceLineNo">185</span>        double sumOfLabelHeights = 0.0;<a name="line.185"></a>
<span class="sourceLineNo">186</span>        for (int i = 0; i &lt; this.labels.size(); i++) {<a name="line.186"></a>
<span class="sourceLineNo">187</span>            sumOfLabelHeights += getPieLabelRecord(i).getLabelHeight();<a name="line.187"></a>
<span class="sourceLineNo">188</span>        }<a name="line.188"></a>
<span class="sourceLineNo">189</span>        double gap = height - sumOfLabelHeights;<a name="line.189"></a>
<span class="sourceLineNo">190</span>        if (this.labels.size() &gt; 1) {<a name="line.190"></a>
<span class="sourceLineNo">191</span>            gap = gap / (this.labels.size() - 1);<a name="line.191"></a>
<span class="sourceLineNo">192</span>        }<a name="line.192"></a>
<span class="sourceLineNo">193</span>        for (int i = 0; i &lt; this.labels.size(); i++) {<a name="line.193"></a>
<span class="sourceLineNo">194</span>            PieLabelRecord record = getPieLabelRecord(i);<a name="line.194"></a>
<span class="sourceLineNo">195</span>            y = y + record.getLabelHeight() / 2.0;<a name="line.195"></a>
<span class="sourceLineNo">196</span>            record.setAllocatedY(y);<a name="line.196"></a>
<span class="sourceLineNo">197</span>            y = y + record.getLabelHeight() / 2.0 + gap;<a name="line.197"></a>
<span class="sourceLineNo">198</span>        }<a name="line.198"></a>
<span class="sourceLineNo">199</span>    }<a name="line.199"></a>
<span class="sourceLineNo">200</span><a name="line.200"></a>
<span class="sourceLineNo">201</span>    /**<a name="line.201"></a>
<span class="sourceLineNo">202</span>     * Sorts the label records into ascending order by y-value.<a name="line.202"></a>
<span class="sourceLineNo">203</span>     */<a name="line.203"></a>
<span class="sourceLineNo">204</span>    public void sort() {<a name="line.204"></a>
<span class="sourceLineNo">205</span>        Collections.sort(this.labels);<a name="line.205"></a>
<span class="sourceLineNo">206</span>    }<a name="line.206"></a>
<span class="sourceLineNo">207</span><a name="line.207"></a>
<span class="sourceLineNo">208</span>    /**<a name="line.208"></a>
<span class="sourceLineNo">209</span>     * Returns a string containing a description of the object for<a name="line.209"></a>
<span class="sourceLineNo">210</span>     * debugging purposes.<a name="line.210"></a>
<span class="sourceLineNo">211</span>     *<a name="line.211"></a>
<span class="sourceLineNo">212</span>     * @return A string.<a name="line.212"></a>
<span class="sourceLineNo">213</span>     */<a name="line.213"></a>
<span class="sourceLineNo">214</span>    public String toString() {<a name="line.214"></a>
<span class="sourceLineNo">215</span>        StringBuffer result = new StringBuffer();<a name="line.215"></a>
<span class="sourceLineNo">216</span>        for (int i = 0; i &lt; this.labels.size(); i++) {<a name="line.216"></a>
<span class="sourceLineNo">217</span>            result.append(getPieLabelRecord(i).toString()).append("\n");<a name="line.217"></a>
<span class="sourceLineNo">218</span>        }<a name="line.218"></a>
<span class="sourceLineNo">219</span>        return result.toString();<a name="line.219"></a>
<span class="sourceLineNo">220</span>    }<a name="line.220"></a>
<span class="sourceLineNo">221</span><a name="line.221"></a>
<span class="sourceLineNo">222</span>}<a name="line.222"></a>




























































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